Valve grinder



C. H. BECH VALVE GRNDER oct'. 23, 1923.

Filed Nov. 6, 1920 Patented Oct. 23, 1923.

UNITED STATES PATENT OFFICE.

CHESTER H. REACH, or RACINE, WISCONSIN, ASSIGNOR To WISCONSIN ELECTRIC COMPANY, A CORPORATION OE WISCONSIN.

VALVE GRINDER.

Application't led` November 6, 1920. Serial No. 422,323'.

To all whom, it may concern:

Be it known that I, CHESTER I-I. BEACH',- a citizen of the United States, residing atl Racine, in the county of Racine and State of Wisconsin, have invented certain new and useful Improvements in Valve Grinders, of which the following is a specification.

My invention relates to improvements in valve grinding attachments. y

One object of the invention is to provide a valve grinding attachment which may be quickly and conveniently applied to an electric motor to adapt the latter for grinding valve seats, and which may be removed with equal facility to permit said motor to be used for other purposes. Another Object is to provide an electric valve grinder of this character which requires only one hand to hold it in place, when in use.

In the accompanying drawings I have illustrated two embodiments of the invention,

Fig. 1 is a side elevation of a small portable electric motor with the valve grinding attachment connected therewith. v Q

Fig. 2 is a front elevation of the attachment, on a slightly larger scale.

F ig. 3 is a bottom View thereof.

Fig. 4 is a side elevation of a modified form of attachment.

Fig. 5 is a plan view thereof, and

Fig. 6 is anv end elevation.

The electric motor 1()l may be of any type adapted for the purpose, and is preferably a small universal motol1 provided at one end with a handle 11, and at the other end with a reduction gearing incased in a housing 12 and carrying a chuck 13 adapted to receive small drills or other tools. The motor casing is also provided with a pair of projections or bosses 14 which Serve to position the grinding attachment, as hereinafter described.

The grinder attachment comprises a suitable frame 15, having a pair of enlarged extremities 16 provided with recesses which t over the bosses 14. Said fra-me has a head 17 with an opening therethrough providing a bearing for the reduced end 18 Of the shaft 19. The grinding blade 20 is set into and Secured in the end of said shaft and is nearly in alinement with the armature shaft. Said shaft has an arm 21 secured thereto, at the shouldered end thereof, which is pivotally connected with a link 22,

the latter being connected also to a shorter arm 23, which is fixed to a short shaft or pin 24 passing also through an opening in the head 17. Said shaft 24 is received within the chuck 13 and gripped thereby in the usual manner. With this arrangement it will be seen that as the shaft 24 rotates, the shaft 19 will be given an oscillating movement.V s

An anti-friction washer 25 is located between the arm 21 and the head 17 and takes the thrust arising during 'the grinding operation. This thrust is communicated by the frame 15 to the projection 26' on the inotor casing, the latter being nearly in line with the point of the ,f grindingv blade 20. (See Fig. 1.) This arrangement prevents binding or cramping, such as would occur if the thrust were taken by the chuck, particularly as the thrust would be eccentric with reference to said-chuck. The bosses 14 by their engagement with the frame 15 also hold the attachment against rotation, when the motor is running. The device asa whole may, therefore, be operated with one hand only as distinguished from certain prior electrically driven grinders in which one hand is required to hold the motor, the other hand holding the grinder proper against rotation.

The pin 24 is 'long enough to be slipped into the opening in the chuck before the projections 14 enter the recesses in the eX- tremitie's 16, thereby facilitating the' attachment of the device to the motor. It will be seen that the grinding attachment is simply slipped in place and requires no fastening means whatever, other than the tightening of the chuck about the pin 24, which would be necessary in any case.

In the form of invention shown in Figs. 4, 5V and 6, the axis of rotation of the grinder shaft is at an angle with the axis of rotation of the armature shaft instead of being substantially in line therewith as in the first form of device described. With the arrangement shown in the drawings the angle is preferably a right angle, but may be any angle. The chuck rotates the pin 24, the latter turning a cam 27 mounted in a bracket 28; Said bracket supporting also the reduced end 29 of the grinder shaft 30, the aXis of said shaft being arranged at an an le with the axis ofthe shaft 24. The reduced end 29 carries the arm 31 having a pin 32 which fits within a groove on the cam 27 and is therefore oscillated as said cam rotates.

rlhe invention is not limited to the preferred embodiments described herein, as various other forms may be devised which fall within the scope of the appended claims.

I claim as my invention:

l. The combination with an electric motor comprising a complete unitary structure, of a chuck secured to the motor shaft, a valve grinding attachment comprising a rotatable partand a stationary part, said rotatable part being removably secured to said chuck and said stationary part having means cooperating with said motor to prevent rotation thereof.

2, The combination with a portable motor having a handle and a chuck, of a valve grinding attachment operatively attached to said motor by means of said chuck, and means interposed between said motor and said attachment to prevent rotation of the latter whe-reby said handle serves as a single handle for the combined motor and grinder.

3. In apparatus of the class described, a shaft, a rotatable pin offset from the axis of said shaft, a driving connection interposed between s-aid pin and shaft, meansv for driving said pin, and a supporting member offset with respect to said pin and eX- tending upwardly in alinenient with` said shaft.

4. The combination with an electric motor having a chuck, of a valve grinding at- Y tachment therefor comprising a support, an

oscillating spindle, means on one of said parts for positioning said support so as to aline said spindle with the motor shaft and offset means connected with said chuck for driving said spindle from said motor shaft.

5. The combination with a motor, having a chuck offset from the axis of the armature shaft, of a grinder frame carrying a ro tatable spindle, a co-operating projection and recesses for positioning said frame on the motor to aline said shaft with the armature shaft, said pin being engaged by said chuck, and links for driving said shaft from said pin.

6. rThe combination with a portable motor and a grinding attachment, of a. pin on said attachment engaged by the driving i ,ermee member of the motor and telescoping means on said grinder and motor for positioning the two relatively and co-operating upon movement in a direction to engage said pin and driving member.

7. The combination of a portable motor, a grinding attachment therefor, a rotatable pin on one part and means on the other part for gripping said pin to transmit rotary motion and to lockl the parts together, the parts also having positive engaging elements for preventing relative rotation.

8. The combination with a portable motor having a casing, a handle, a reduction gearing and driving shaft eccentric with respect to the armature shaft, of a grinding attachment comprising a body and a spindle rotatably carried thereby in substantial alinement with said armature shaft, said body engaging said casing to transmit the thrust of the spindle thereto and said spindle having eccentric driving connections engaging the driving shaft on the motor and driven thereby without transmittingvan eccentric thrust thereto.

9. rlhe combination with an electric motor having a chuck, of a spindle supported by said chuck at one side of the longitudinal aXis of the latter, means for driving said spindle from said chuck, and a support interposed between the upper end of said spindle and said motor.

l0. rllhe combination with an electric motor having a chuck, of a spindle supported by said chuck at one side of the longi-Y tudinal axis of the latter, means for driving said spindle from said chuck, and a support interposed between the upper end of said spindle and said motor, said spindle being in alinement with the armature shaft of the motor. Y Y

l1. n combination, a portable motor, a

chuck carried by said motor and offset with Y respect to the armature shaft thereof, a grinding attachment held by said chuck and having a spindle depending therefrom in alinement with said armature shaft, and means interposed between said attachment and said motor for preventing rotation of the former.A

in testimony whereof, I have subscribed my name.

CHESTER H. BEACH. 

